Have just been doing some researches to come up with an idea of making that splitting method when suddenly noticed that some web pages are using images like:
Code:
<img src="data:image/png;base64,aFHEwifehFH.....HIFHiqDDAddh==">
After some google work, a found the name and the wikipage:
http://en.wikipedia.org/wiki/Data_URI_scheme
It simply prints every bit of the image file into the html and, hooray, it doesn't look like an image to the proxy server anymore!